Rhizomatous, erect perennial, herb, 0.3-1 m high. Fl. Sep to Oct. Sand, clay. Swamps, seasonally wet flats.
Beard’s Provinces: South-West Province.
IBRA Regions: Jarrah Forest, Swan Coastal Plain, Warren.
IBRA Subregions: Perth, Southern Jarrah Forest, Warren.
Local Government Areas (LGAs): Augusta-Margaret River, Busselton, Manjimup, Nannup.
Rhizomes tufted, glabrous. Basal sheath glabrous, glossy, striate. Culms terete or semi-terete, internal structure (at base of culm) hollow, glabrous, striate, not marbled, not fasciculate. Culm 630-910 mm long. Sheaths (including blade) appressed throughout, dull, not striate, glabrous, margins not translucent. Apex obtuse, glabrous. Dioecious (with separate male and female plants). Male and female inflorescences distinctly dissimilar, posture (male inflorescences only) More or less erect, Culms unbranched below the inflorescence. Male spikelet 8-13 mm long. Subtending bract hairy, Outer bract 5-7 mm long, margins firm and opaque, Apex acuminate to attenuate. Perianth glabrous. 3.2-3.7 mm long. Inner bract hairy, margins firm and opaque, Apex acuminate to attenuate. Inner bract 5-5.8 mm long. Filament 2-2.7 mm long. Anther 1.2-1.8 mm long. Female spikelet 10-15 mm long. Subtending bract hairy, margins firm and opaque, Apex acuminate to attenuate. Outer bract 6-10 mm long. Perianth hairy. 4-8 mm long. Inner bracts 5.6-6.7 mm long, glabrous, margins firm and opaque, Apex acuminate to attenuate. Style two (or two-branched). 4-4.3 mm long. Fruit bilocular (capsule). Flowering Time September or October. Botanical Province South-West, IBRA Bioregions Swan Coastal Plain, Jarrah Forest or Warren.
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Western Australian Herbarium (1998–). FloraBase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions. https://florabase.dpaw.wa.gov.au/